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Member

Bartłomiej SIENKIEWICZ

EPP · Poland

Group
EPP PPE
Country
Poland
Roll-call participation
97.6 %ⓘ of 5 928 roll calls in office · chamber median 90.2 % · whole term, roll calls
With majority line
92.0 %ⓘ of 5 787 votes where the group had a line · EPP median 93.6 %
More facts (5)
National party
KO Koalicja Obywatelska
In office
Since 16 Jul 2024
Against clear line
312 of 5 512 votesⓘ
Committees
AFCO, LIBE (substitute)
Member id
86057
More

Record

The member’s figures against the median of their group and of the chamber. Each vote counts the member in the group they belonged to that day.

Roll-call participation ⓘ

97.6 %

5 787 of 5 928 roll calls while in office

EPP median: 89.9 % (+7.7 pts)

Chamber median: 90.2 %

With majority line ⓘ

92.0 %

5 326 of 5 787 votes where their group had a line

EPP median: 93.6 % (−1.6 pts)

Against clear line ⓘ

5.7 %

312 of 5 512 votes where their group had a clear line

249 opposite (for ↔ against), 60 abstained against the line, 3 voted for or against when the line was to abstain

Abstention ⓘ

1.9 %

111 of 5 787 votes cast

Participation 97.6 % — EPP median 89.9 %, 196 members.ⓘ
Data as a table
Participation among the 196 members of the EPP with enough votes.
FigureParticipation
Bartłomiej SIENKIEWICZ97.6 %
EPP median89.9 %
Lowest in the group17.0 %
Highest in the group99.6 %
Members196
With majority line 92.0 % — EPP median 93.6 %, 196 members.ⓘ
Data as a table
With majority line among the 196 members of the EPP with enough votes.
FigureWith majority line
Bartłomiej SIENKIEWICZ92.0 %
EPP median93.6 %
Lowest in the group70.2 %
Highest in the group99.5 %
Members196
  • Whole term, 5 928 roll-call votes. The dots are the other members of EPP; no ranks.
  • “No vote recorded” is not the same as absent: leave, illness and chairing the sitting look the same.
  • A group’s line is inferred from its members’ votes — Parliament publishes no whip.

Votes, 620

Export

Every final roll-call vote of the term with the member’s position, newest first.

Result: for–against–abstained. Majority line: how most of the member’s group voted that day (“Tie” when no position won). ≠ group marks a vote otherwise than a clear line (at least two thirds, with at least 10 members voting) of their group.
DateDecisionResultPositionMajority line
29 Apr 2026Discharge 2024: European Public Prosecutor’s Office Discharge decision adopted 454 for, 161 against, 29 abstainedPosition: For Majority line: For
29 Apr 2026Discharge 2024: Agencies Discharge decision adopted 475 for, 107 against, 71 abstainedPosition: For Majority line: For
29 Apr 2026Discharge 2024: Joint Undertakings Discharge decision adopted 525 for, 104 against, 16 abstainedPosition: For Majority line: For
29 Apr 2026Mobilisation of the European Globalisation Adjustment Fund for Displaced Workers: application EGF/2025/008 BE/Liberty - Belgium Passed 586 for, 48 against, 16 abstainedPosition: For Majority line: For
29 Apr 2026Genetically modified soybean MON 94637 Objection passed 412 for, 145 against, 11 abstainedPosition: Against Majority line: Against
29 Apr 2026Situation of fundamental rights in the European Union in 2024 and 2025 Adopted 328 for, 199 against, 98 abstainedPosition: Abstained Majority line: For
29 Apr 2026The Commission’s 2025 Rule of Law report Adopted 387 for, 191 against, 46 abstainedPosition: For Majority line: For
29 Apr 2026Monitoring the application of European Union law in 2023, 2024 and 2025 Adopted 416 for, 190 against, 15 abstainedPosition: For Majority line: For
28 Apr 2026Generalised scheme of tariff preferences Passed 459 for, 127 against, 70 abstainedPosition: For Majority line: For
28 Apr 2026Welfare of dogs and cats and their traceability Passed 558 for, 35 against, 52 abstainedPosition: For Majority line: For
28 Apr 2026Amendments to Biocidal Products Regulation as regards the extension of certain data protection periods Passed 591 for, 54 against, 8 abstainedPosition: For Majority line: For
28 Apr 2026European Globalisation Adjustment Fund: workers affected by imminent job displacement Passed 566 for, 67 against, 26 abstainedPosition: For Majority line: For
28 Apr 2026Interim report on the proposal for the multiannual financial framework for 2028-2034 Interim report adopted 370 for, 201 against, 84 abstainedPosition: For Majority line: For
28 Apr 2026Guidelines for the 2027 budget - Section III Adopted 389 for, 191 against, 75 abstainedPosition: For Majority line: For
28 Apr 2026Amendments to Parliament's Rules of Procedure concerning appointments to Union agencies and bodies (Rule 135) Adopted 657 for, 0 against, 3 abstainedPosition: For Majority line: For
28 Apr 2026Control of the financial activities of the European Investment Bank Group – annual report 2024 Adopted 377 for, 254 against, 31 abstainedPosition: For Majority line: For
28 Apr 2026Importance of consent-based rape legislation in the EU Adopted 447 for, 160 against, 43 abstainedPosition: For Majority line: For
28 Apr 2026Protection of the European Union’s financial interests – combating fraud – annual report 2024 Rejected 231 for, 389 against, 33 abstainedPosition: For Majority line: For
28 Apr 2026The role of ocean diplomacy for the competitiveness of EU fisheries and aquaculture Adopted 430 for, 107 against, 115 abstainedPosition: For Majority line: For
28 Apr 2026Control, transparency and traceability of performance-based instruments Adopted 527 for, 85 against, 33 abstainedPosition: For Majority line: For
28 Apr 2026Enhancing connectivity, preserving cultural heritage and driving local excellence in European tourism – destination management and regional tourism growth Adopted 439 for, 42 against, 129 abstainedPosition: For Majority line: For
28 Apr 2026Extension of the term of office of the Special Committee on the European Democracy Shield Adopted 422 for, 202 against, 9 abstainedPosition: For Majority line: For
26 Mar 2026Common system for the return of third-country nationals staying illegally in the Union (Return Regulation) Negotiating mandate approved 389 for, 206 against, 32 abstainedPosition: For Majority line: For
26 Mar 2026Combating corruption Passed 581 for, 21 against, 42 abstainedPosition: For Majority line: For
26 Mar 2026Proposal for a regulation of the European Parliament and of the Council amending Regulation (EU) 2021/1232 as regards the extension of its period of application Failed 228 for, 311 against, 92 abstainedPosition: Against Majority line: Against
26 Mar 2026Adjustment of customs duties and opening of tariff quotas for the import of certain goods originating in the United States of America Passed 417 for, 154 against, 71 abstainedPosition: For Majority line: For
26 Mar 2026Non-application of customs duties on imports of certain goods Passed 437 for, 144 against, 60 abstainedPosition: For Majority line: For
26 Mar 2026Simplification of the implementation of harmonised rules on artificial intelligence (Digital Omnibus on AI) Passed 569 for, 45 against, 23 abstainedPosition: For Majority line: For
26 Mar 2026United Nations Convention on the International Effects of Judicial Sales of Ships Consent given 605 for, 3 against, 9 abstainedPosition: For Majority line: For
26 Mar 2026EU-China Agreement: modification of concessions on all the tariff rate quotas included in the EU Schedule CLXXV Consent given 603 for, 3 against, 33 abstainedPosition: For Majority line: For
26 Mar 2026EU-Lebanon Agreement for scientific and technological cooperation setting, participation of Lebanon in the Partnership for Research and Innovation in the Mediterranean Area (PRIMA) Consent given 618 for, 6 against, 5 abstainedPosition: For Majority line: For
26 Mar 2026Mobilisation of the European Globalisation Adjustment Fund for Displaced Workers: application EGF/2025/005 AT/KTM - Austria Passed 584 for, 39 against, 13 abstainedPosition: For Majority line: For
26 Mar 2026Mobilisation of the European Globalisation Adjustment Fund for Displaced Workers: application EGF/2025/007 BE/Casa - Belgium Passed 575 for, 48 against, 10 abstainedPosition: For Majority line: For
26 Mar 2026Union framework for the national calculation of life-cycle global warming potential Objection failed 208 for, 414 against, 10 abstainedPosition: Against Majority line: Against
26 Mar 2026Global Gateway – past impacts and future orientation Adopted 371 for, 146 against, 80 abstainedPosition: For Majority line: For
12 Mar 2026Calculation of emission credits for heavy-duty vehicles for the reporting periods of the years 2025 to 2029 Passed 473 for, 81 against, 9 abstainedPosition: For Majority line: For
12 Mar 2026Package travel and linked travel arrangements: make the protection of travellers more effective and simplify and clarify certain aspects Passed 537 for, 2 against, 24 abstainedPosition: For Majority line: For
12 Mar 2026Human trafficking and grave human rights violations linked to the recruitment of non-Russian nationals, in particular from Africa, for Russia’s war of aggression in Ukraine Adopted 479 for, 17 against, 43 abstainedPosition: For Majority line: For
12 Mar 2026The arbitrary detention of President Mohamed Bazoum by the junta in Niger Adopted 524 for, 2 against, 29 abstainedPosition: For Majority line: For
12 Mar 2026Case of Elene Khoshtaria and political prisoners under the Georgian Dream regime Adopted 438 for, 37 against, 81 abstainedPosition: For Majority line: For
12 Mar 2026Activities of the European Ombudsman – annual report 2024 Rejected 233 for, 250 against, 76 abstainedPosition: For Majority line: For
11 Mar 2026Proposal for a regulation of the European Parliament and of the Council amending Regulation (EU) 2021/1232 as regards the extension of its period of application Passed 458 for, 103 against, 63 abstainedPosition: For Majority line: For
11 Mar 2026Council of Europe Framework Convention on Artificial Intelligence and Human Rights, Democracy and the Rule of Law Consent given 455 for, 101 against, 74 abstainedPosition: For Majority line: For
11 Mar 2026EU-Ecuador Agreement: cooperation between Europol and the Ecuadorian authorities competent for combating serious crime and terrorism Consent given 586 for, 21 against, 11 abstainedPosition: For Majority line: For
11 Mar 2026Mobilisation of the European Globalisation Adjustment Fund for Displaced Workers: application EGF/2025/004 BE/Tupperware – Belgium Passed 562 for, 53 against, 19 abstainedPosition: For Majority line: For
11 Mar 2026Framework Agreement on relations between the European Parliament and the European Commission Adopted 446 for, 100 against, 72 abstainedPosition: For Majority line: For
11 Mar 2026Gender pay and pension gap in the EU: state of play, challenges and the way forward, and developing guidelines for the better evaluation and fairer remuneration of work in female-dominated sectors Adopted 458 for, 72 against, 98 abstainedPosition: For Majority line: For
11 Mar 2026European Semester for economic policy coordination 2026 Adopted 392 for, 219 against, 18 abstainedPosition: For Majority line: For
11 Mar 2026European Semester for economic policy coordination: employment and social priorities for 2026 Adopted 404 for, 208 against, 20 abstainedPosition: For Majority line: For
11 Mar 2026EU enlargement strategy Adopted 385 for, 147 against, 98 abstainedPosition: For Majority line: For

Show all 50 votes on this page

Roll-call participation

One cell per sitting while in office, shaded by the share of that day’s roll calls the member voted in. The official attendance register is kept separately by Parliament.

No vote recorded on 6 of 107 sittings with roll calls.

"No vote recorded" is not the same as absent: leave, illness and chairing the sitting look the same.

Data as a table
Roll calls held at each sitting while in office and how many of them the member voted in.
SittingRoll callsVoted in
17 Jul 2024230
18 Jul 202410
16 Sept 202422
18 Sept 202422
19 Sept 20249292
7 Oct 202422
8 Oct 202411
9 Oct 20241818
10 Oct 202444
21 Oct 202422
22 Oct 20241010
23 Oct 2024129126
24 Oct 20241313
13 Nov 202422
14 Nov 20243636
25 Nov 202422
26 Nov 20241818
27 Nov 20241110
28 Nov 20245756
17 Dec 20241313
18 Dec 20243333
19 Dec 20244545
20 Jan 202522
21 Jan 202511
22 Jan 202522
23 Jan 20254541
10 Feb 202511
11 Feb 20253232
12 Feb 20251010
13 Feb 2025300
10 Mar 202522
11 Mar 202599
12 Mar 2025228224
13 Mar 20252421
31 Mar 202533
1 Apr 20253534
2 Apr 2025251249
3 Apr 20256262
5 May 202555
6 May 20251010
7 May 2025220213
8 May 2025103102
21 May 202522
22 May 20255353
16 Jun 202520
17 Jun 20254141
18 Jun 20259190
19 Jun 20258785
7 Jul 202510
8 Jul 20255554
9 Jul 2025134132
10 Jul 20253636
8 Sept 202511
9 Sept 2025101100
10 Sept 20253434
11 Sept 20256952
6 Oct 202522
7 Oct 202555
8 Oct 20255554
9 Oct 20256564
20 Oct 202533
21 Oct 20251312
22 Oct 2025186186
23 Oct 20255554
13 Nov 2025267262
24 Nov 202530
25 Nov 20257575
26 Nov 202510097
27 Nov 2025125125
15 Dec 202544
16 Dec 20256665
17 Dec 20254343
18 Dec 20254241
20 Jan 20266767
21 Jan 2026112112
22 Jan 20265858
9 Feb 202622
10 Feb 20263838
11 Feb 20261313
12 Feb 2026141140
24 Feb 20264343
9 Mar 202611
10 Mar 2026197194
11 Mar 20266060
12 Mar 20263434
25 Mar 202633
26 Mar 20266969
27 Apr 202622
28 Apr 2026225225
29 Apr 2026296294
30 Apr 20266868
18 May 202644
19 May 202633
20 May 20269695
21 May 20269897
15 Jun 202622
16 Jun 20264040
17 Jun 2026127126
18 Jun 20267777
6 Jul 202622
7 Jul 20267272
8 Jul 2026144143
9 Jul 20266766
14 Sept 202611
15 Sept 2026155152
16 Sept 20268079
17 Sept 2026124123

Voting neighbours

Members who voted the same way most often in the roll calls they both took part in, within and outside the member’s group (group at the date of each vote), over all roll calls of the term.

At least 200 shared roll calls over at least six months in office together. Within = both sat in the same group on the date of the vote; a member who changed group can appear on both lists. Baseline = the median agreement of all pairs of members of the groups the two sat in on the date of each shared vote (within: the group they shared; outside: the two groups), weighted by the votes they shared in each combination.

Within EPP

Agreement: roll calls where both cast the same position, of the roll calls both voted in while in the same group (“shared”); a count below 50 shared. Baseline: the median agreement of every pair of members of that group.
SelectMemberGroupCountryAgreementBaseline
Bogdan Andrzej ZDROJEWSKI EPPPoland95 % of 5 713 shared89 %
Andrzej BUŁA EPPPoland95 % of 5 306 shared89 %
Andrzej HALICKI EPPPoland95 % of 5 275 shared89 %
Ewa KOPACZ EPPPoland95 % of 5 723 shared89 %
Krzysztof BREJZA EPPPoland95 % of 5 397 shared89 %
Magdalena ADAMOWICZ EPPPoland95 % of 5 396 shared89 %
Mirosława NYKIEL EPPPoland94 % of 5 171 shared89 %
Jagna MARCZUŁAJTIS-WALCZAK EPPPoland94 % of 5 439 shared89 %
Bartosz ARŁUKOWICZ EPPPoland94 % of 5 531 shared89 %
Marta WCISŁO EPPPoland94 % of 5 527 shared89 %

Show all 10 neighbours

Outside the group

Agreement: roll calls where both cast the same position, of the roll calls both voted in while in different groups (“shared”); a count below 50 shared. Baseline: the median agreement of every pair of members of the groups the two sat in on those votes (groups at the date, weighted by the votes shared in each combination).
SelectMemberGroupCountryAgreementBaseline
Urmas PAET RenewEstonia84 % of 5 181 shared82 %
Eugen TOMAC RenewRomania82 % of 4 183 shared82 %
Dan BARNA RenewRomania82 % of 5 114 shared82 %
Hilde VAUTMANS RenewBelgium82 % of 5 608 shared82 %
Katri KULMUNI RenewFinland82 % of 4 574 shared82 %
Jeannette BALJEU RenewNetherlands81 % of 5 077 shared82 %
Ivars IJABS RenewLatvia81 % of 4 425 shared82 %
Bart GROOTHUIS RenewNetherlands81 % of 4 378 shared82 %
Benoit CASSART RenewBelgium81 % of 5 306 shared82 %
Anouk VAN BRUG RenewNetherlands81 % of 4 350 shared82 %

Show all 10 neighbours

Work

Seats in committees, delegations and intergroups, and the dossiers the member leads, shadows or negotiates.

Seats

Body: the committee, delegation or intergroup, with its kind. Role: the member’s role in it. From, To: the dates of the seat (“now” while it lasts).
BodyRoleFromTo
Committee on Constitutional AffairsAFCO CommitteeMember19 Jul 2024now
Committee on Civil Liberties, Justice and Home AffairsLIBE CommitteeSubstitute19 Jul 2024now
Special Committee on the European Democracy ShieldEUDS Special committeeMember23 Jan 2025now
Delegation to the EU-Russia Parliamentary Cooperation CommitteeD-RU DelegationMember16 Jul 2024now
Delegation for relations with the Maghreb countries and the Arab Maghreb Union, including the EU-Morocco, EU-Tunisia and EU-Algeria Joint Parliamentary CommitteesDMAG DelegationMember19 Sept 2024now

Show all 5 seats

Dossiers

Dossier: the procedure the declaration names (“No dossier named” for a delegation without one). Role: rapporteur, shadow rapporteur, negotiator or delegation. Committee: the committee that appointed them. Date: of the declaration.
DossierRoleCommitteeDate
No dossier namedDelegation vice-chairD-RU4 Sept 2026
Monitoring and controlling drug precursors and repealing Regulations (EC) No 273/2004 and (EC) No 111/2005RapporteurLIBE10 Feb 2026
Delegation to Morocco for Morocco-EU Joint Parliamentary CommitteeOfficial delegationDMAG22 Oct 2025
EUROPEAN PARLIAMENT’S RIGHT OF INQUIRYShadow rapporteurAFCO10 Jan 2025
No dossier namedDelegation vice-chairD-RU30 Sept 2024
Commission proposal for a Regulation amending Regulation (EU) 2021/1148 (Instrument for Financial Support for Border Management and Visa Policy) as regards the financial envelope and the allocation for the thematic facility - 2024/0059(COD) -Shadow rapporteurLIBE10 Sept 2024

Show all 6 dossier roles

Topics they work on (model-assigned)

Counts: dossiers they spoke on, led or amended, and their questions and motions.

In the chamber

Speeches and statements in plenary debates, newest first; the verbatim report is on Parliament’s site.

21 contributions recorded; 2 on behalf of their group; 31 minutes of speaking time.

Date: the sitting. Debate: the item debated, and the group when they spoke on its behalf. Kind: speech or written statement, with speaking time. Verbatim: the verbatim report on Parliament’s site.
DateDebateKindVerbatim
15 Sept 2026The recent hybrid attacks and instrumentalisation of migrants in Ceuta and the need for a coordinated response to protect the EU’s external borders (debate) Speech · 1 minRead
15 Sept 2026Findings and recommendations of the Special Committee on the European Democracy Shield (debate) Speech · 2 minRead
19 May 2026Europe's response to reduced US military deployments in Europe, particularly at its Eastern flank in the light of the latest US decisions (debate) Speech · 1 minRead
19 May 2026EU governance under pressure – institutional responses to global challenges (debate) on behalf of EPPSpeech · 2 minRead
29 Apr 2026Danger of normalising relations with Russia, including its participation in major cultural and sports events (debate) Speech · 1 minRead
21 Jan 2026Restoring control of migration: returns, visa policy and third-country cooperation (topical debate) Speech · 2 minRead
17 Dec 2025Cases of pro-Russian espionage in the European Parliament (debate) Speech · 2 minRead
15 Dec 2025Murder of Mehdi Kessaci - urgent need for ambitious European action against drug trafficking (debate) Speech · 1 minRead
8 Oct 2025United response to recent Russian violations of the EU Member States’ airspace and critical infrastructure (debate) Speech · 1 minRead
10 Sept 2025State of the Union (debate) Speech · 1 minRead

Show all 21 recent contributions

Questions and motions, 23

Parliamentary questions and motions for resolutions the member authored or co-signed, newest first.

Date: tabled. Title: the question or motion, with its id. Kind: written question or motion for a resolution, with the number of co-authors. Answer: the date of the answer to a question.
DateTitleKindAnswer
13 Jul 2026Missing and runaway children as an indicator of violence, abuse and grooming E-10-2026-002868Written questionwith 15 co-authorsNot yet answered
29 Jun 2026Protecting minors online from manipulation, bullying and grooming E-10-2026-002680Written questionwith 9 co-authors11 Sept 2026
10 Jun 2026MOTION FOR A RESOLUTION on the recruitment of children by organised crime B-10-2026-0275Motion for a resolutionwith 33 co-authors—
9 Jun 2026Chinese tomato concentrate imports: protecting EU producers and food security P-10-2026-002375Priority written questionwith 23 co-authors13 Jul 2026
20 May 2026Russia’s admission to the Biennale Festival and EU funding E-10-2026-002082Written question16 Jul 2026
25 Mar 2026Ensuring competition and strategic autonomy in the AI gigafactory supply chain E-10-2026-001255Written questionwith 17 co-authors19 Jun 2026
24 Feb 2026Ensuring risk assessment as the basis for proportionate regulation of cosmetic products E-10-2026-000762Written questionwith 20 co-authors16 Apr 2026
18 Feb 2026Checks on the presence of prohibited substances and trace impurities in non-EU cosmetic products entering the single market E-10-2026-000688Written questionwith 21 co-authors21 May 2026
18 Feb 2026Inspections to ensure regulatory conformity of cosmetic products in the single market with the Cosmetic Products Regulation E-10-2026-000687Written questionwith 22 co-authorsNot yet answered
9 Feb 2026MOTION FOR A RESOLUTION on World Cancer Day B-10-2026-0141Motion for a resolutionwith 18 co-authors—

Show all 23 questions and motions

Amendments tabled in committee, 13

Committee amendment documents that carry amendments by the member, with how many are theirs.

Date: of the amendment document. Text amended: the dossier and the document’s id. Committee: where the amendments were tabled. Amendments: how many in the document are the member’s.
DateText amendedCommitteeAmendments
23 Jun 2026on the proposal for a regulation of the European Parliament and of the Council establishing the European Fund for economic, social and territorial cohesion, agriculture and rural, fisheries and maritime, prosperity and security for the period 2028-2034 and amending Regulation (EU) 2023/955 and Regulation (EU, Euratom) 2024/2509 CJ71-AM-790099 CJ712
29 Apr 2026Institutional aspects of artificial intelligence in the context of European integration AFCO-AM-787899 AFCO2
17 Mar 2026Amending Decision (EU) 2015/1814 as regards the market stability reserve for the buildings, road transport and additional sector ENVI-AM-785330 ENVI7
12 Feb 2026Findings and recommendations of the Special Committee on the European Democracy Shield EUDS-AM-784433 EUDS4
12 Feb 2026Findings and recommendations of the Special Committee on the European Democracy Shield EUDS-AM-784407 EUDS2
12 Feb 2026Findings and recommendations of the Special Committee on the European Democracy Shield EUDS-AM-784408 EUDS7
12 Feb 2026Findings and recommendations of the Special Committee on the European Democracy Shield EUDS-AM-784367 EUDS1
12 Feb 2026Findings and recommendations of the Special Committee on the European Democracy Shield EUDS-AM-784405 EUDS7
12 Feb 2026Findings and recommendations of the Special Committee on the European Democracy Shield EUDS-AM-784406 EUDS3
30 Jan 2026Interim report on the proposal for the multiannual financial framework for 2028-2034 BUDG-AM-784187 BUDG3

Show all 13 amendment documents

Connections

Dossiers they lead or shadow, committees, party, delegation and other related pages.

Political group

National delegation

  • Delegation Poland National delegation

Sources & citation

Where the facts on this page come from, and how to cite it.

Data source
Licensed CC BY 4.0.
Data version
data version f37e5638cded (25 Sept 2026) · methods: group-at-date v1, participation v1, abstention v1, loyalty v1, against-clear v1, cohesion v1, agreement v1, group-agreement v1, winning-side v1, similar-votes v1, scope v1, data-version v1 · methods
Retrieved
25 September 2026

Cite as

EU Parl Watch Research (2026). “Bartłomiej SIENKIEWICZ”. Member record. memberId 86057. EU Parl Watch Research. https://news.eu-parl.st-solutions.dev/members/86057?page=4&vscope=final (retrieved 25 September 2026). Official source: Member’s profile, European Parliament, https://www.europarl.europa.eu/meps/en/86057. Data: EP Open Data: member record, https://data.europarl.europa.eu/api/v2/meps/86057?format=application%2Fld%2Bjson (CC BY 4.0); data version f37e5638cded (25 Sept 2026) · methods: group-at-date v1, participation v1, abstention v1, loyalty v1, against-clear v1, cohesion v1, agreement v1, group-agreement v1, winning-side v1, similar-votes v1, scope v1, data-version v1.
BibTeX
@misc{epw-member-86057,
  author = {{EU Parl Watch Research}},
  title = {{Bartłomiej SIENKIEWICZ}},
  year = {2026},
  howpublished = {\url{https://news.eu-parl.st-solutions.dev/members/86057?page=4&vscope=final}},
  url = {https://news.eu-parl.st-solutions.dev/members/86057?page=4&vscope=final},
  urldate = {2026-09-25},
  publisher = {EU Parl Watch Research},
  note = {Member record. memberId 86057. Official source: https://www.europarl.europa.eu/meps/en/86057. Data: EP Open Data: member record (CC BY 4.0); data version f37e5638cded (25 Sept 2026) · methods: group-at-date v1, participation v1, abstention v1, loyalty v1, against-clear v1, cohesion v1, agreement v1, group-agreement v1, winning-side v1, similar-votes v1, scope v1, data-version v1}
}